The first trophic level of an ecosystem consists of
A) heterotrophs.
B) detritus feeders.
C) producers.
D) secondary consumers.
E) primary consumers.
C
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Which of the following elements is a plant micronutrient?
1.Calcium 2.Iron 3.Potassium 4.Sulfur
In Mendel's pea plants, yellow seeds are dominant to green seeds. Purple flowers are dominant to white flowers. Use Y and y for the seed color alleles and P and p for the flower color alleles. Flower color and seed color assort independently. If a plant
that is heterozygous for both flower color and seed color genes is self-fertilized, what proportion of the offspring will have one of the dominant phenotypes, either the seed color or flower color, but not both? A) 9/16 B) 9/32 C) 6/64 D) 6/16 E) 6/32
What does the enzyme nitrogenase do?
A. It is a eukaryotic enzyme that removes amino groups from proteins that get converted into ammonia. B. It is a prokaryotic enzyme that converts nitrogen gas to ammonia. C. It is a bacterial enzyme that oxidizes nitrate to gaseous nitrogen. D. It is a eukaryotic enzyme that oxidizes ammonium to form nitrate.
Biofilm infections are harder to treat than the same free-living organisms because
A. When part of a biofilm community, the bacterial cells express different genes thus changing their antibiotic susceptibility B. Bacteria in a biofilm exist only on synthetic surfaces such as catheters, so they cannot be treated with antibiotics C. The organisms in the biofilm degrade the antibiotics at a much faster rate than their free living counterparts D. Organisms in a biofilm develop antibiotic resistance more rapidly than free living cells